Kitchen ventilator



Dec, 118 1923.

W. R. POWELL KITCHEN VENTILATOR Original Filed May 23.

5140mm ma i? PM Patented Dec. 1%, I923.

iaiasee WALTER R. POWELL, 0F NEW YORK, N. Y.

earner @FFHQE.

KITCHEN VENTILATOR.

Applicationfiled May 23, 1916, SeriaiNo. 99,292. Renewed March 29, 1923.

To all whom it may concern:

Be it known that I, lVAL'rEn R. POWELL, a citizen of the United States, and a resident of New York, in the county and State of New York, have invented new and useful Improvements in Kitchen Ventilators, of which the following is a specification.

This invention relates to kitchen venti-- take opening near the ceiling of theroom Where the heated air and fumes collect, the

' fan having a driving connection with an the installation of air motor also arranged in the flue wall immcdiately over the stove or range in position to be driven by the hot air risingtherefrom. The motor fan is preferably arranged in a conduit leading from the hood Fig. 2 is a verticalsectional view of the ventilator detached; and

Fig. 3 is a front'elevation with the cover of the air intake removed.

Referring to the drawings, 1 indicates the frame of the ventilator which consists preferably of a sheet metal box of rectangular shape, and of a depth equal to the averagethickness of a flue wall. The box is open on its rear sideexcept for a deflecting sheet 2 lyin back of the motor fan 3 which is provide a to deflect the current of gas through the fan motor upwardly into the ascending gas current in the flue without producing cross currents. The front wall 40f the casing'is provided with a circular opening for the motor fan 3, the opening being surrounded by a flange 5 upon which the pipe 6 (see Fig. 1)" of the hood 7 of the range is fitted in the customary manner.

The fan 3 is rotatably supported on a stud and carried by .a vertical frame bar 8 rising from the bottom wall of the casing l, the fan being provided with a spur gear 9 through which the power generated by the fan motor is delivered by means of a vertical shaft 10 to the exhaust fan 11 at the top of the casing.

The fan 11 is also supported for rotation in the frame bar 8 and the axle of the fan is provided with a bevel gear 12 driven from the shaft 10 by a corresponding gear. Thefan 11 is preferably fitted in an auxiliary casing 13 set in the main casing and comprising a circular exhaust opening closely surrounding the fan 11 and an enlarged intake opening covered by a screen or grill 14 with inclined walls 15 connecting the two parts of the casing.- Theauxiliary casing 13 extends to near the top walliof the main casing so that the intake opening will be close to the ceiling.

In operation the fan motor?) will be driven by the hot air and gases arising directly from the range and passing through the conduit 6 and thence through the fan against the deflector 2, whence they l will be deflected by the draft of the flue. The motor fan drives the exhaust fan 11 which may be of the same capacity a the lower fan, but is preferably of less capacity either through a Smaller number of blades, as shown, or of smaller pitch so as to be driven-at a fair rate of speed by the normal draft through the conduit 6.

The passage of air up through the box 1.

into the fine across the delivery side of the fan 11 has an injector effect, reducing the pressure on the delivery side of the fan sothat the natural draft through the fan 11 tends to drive it in the same direction as it is driven by the motor fan. The chief purpose of the motor fan is toincrease the capacity of the exhaust fan 11. In other words, the greater natural draft through the motor fan Is made use of to increase the effectiveness of the exhaust fan which withdraws the fumes of the room itself whence they would otherwise spread into theadjoining rooms. I claim:

1. In a kitchen ventilator, the combination of a heater and a flue therefor, said flue space to be ventilated, fans supported at said openings, and power transn'iitting connections between said fans whereby the fan at the first mentioned opening operates as a motor to drive the other fan and increase the volume of gas passing through said second openin 2. In a kitchen ventilator the combination with a range having a hood and a flue there-. for, said flue having two openings in its vertical wall, fans supported adjacent said openings,.-a conduit from said hood to said lower fan, power transmitting connections between said fans whereby the fan nearer said hood operates as a motor to drive the other fan and increase the volume of gas through the other flue opening.

Signed at New York, in the county of New York and State of New York, this 20th day of May, 1916.

\VALTER R. POWELL. 

